Whistle



FIG. 1 is a perspective view of a whistle showing my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a right side elevational view thereof, the left side being a mirror image; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a whistle, as shown and described. 